Fixes #231

Implements a poster feature for the proposals dashboard

app/helpers/application_helper.rb

@@ -60,4 +60,11 @@ module ApplicationHelper
   def kaminari_path(url)
     "#{root_url.chomp("\/")}#{url}"
   end
+
+  def self.asset_data_base64(path)
+    asset = Rails.application.assets.find_asset(path)
+    throw "Could not find asset '#{path}'" if asset.nil?
+    base64 = Base64.encode64(asset.to_s).gsub(/\s+/, "")
+    "data:#{asset.content_type};base64,#{Rack::Utils.escape(base64)}"
+  end
 end